ChrisMC

Megane RS trophy. Pic isn't mine but it's identical. Perfect car for getting grumbled at even when driving sensibly.

So a little update. I went for the delayer chip as it was only a couple of quid, went to test fire it, no BBs came out. Noooooo. Dropped the mag, that's funny, boo bb at the top. Something had jammed in the mag. This happened with this mag a while ago and I had to strip it down to unblock it. Swapped to another mag. Fed every shot flawlessly. Wahoo! I stuck in a 11.1V lipo and it fed flawlessly on that too. I think I finally have a reliable build yay. I can tell the difference in trigger response on the 11.1 but I'm not sure if it's enough to warrant the extra wear on the motor. I'm already running it with braking on so it might be a bit much for it. Anyway, I've ordered some pts epm mags as none of my m4 hi caps have been reliable. They are supposed to perform flawlessly. If polished the crapout of the barrel and Overhauled the hop unit too. I think some grease had got on the rubber from running the gun while the gearbox was only just assembled. It's hopping a geoffs 0.32 with plenty of travel to spare. Just counting the days until my next skirmish now. I thought I had a good knowledge base when starting this build but if anything, I learned more in the 2 weeks since I first put it together than I did before. Every tiny detail matters! Thanks everyone for all the help and comments, following your advice really has made a huge difference to the performance of my gun. Have fun and play safe!

Running well on 7.4V. I have found that the gun feed less reliably as the high caps near the end of the windage. If I wind them to the max then the gun feeds every shot flawlessly. I guess with the higher cycle speed it just needs that extra tension in the spring to push the bb up into the chamber in time.

Heres a vid on the 7.4V https://youtu.be/OCZCXEn1xM4

Thanks again for all the info guys. so i just swapped out one of my 7.4 connectors and tried it in the M4. It feeds much better and the trigger response is still pretty much instant so i think that's what i'm going to use. thinking about it now, i bet i was pulling some pretty serious current on the 3S battery. The only problem is i don't think, dispite the 25-50c rating, my 1200mAh 2s batteries will stand up too well to a half day on the field in the M4 as they were getting warm off 30-40 rounds of quick semi fire when testing. Off to hobby king again i guess! My other hobby is flying stupidly overpowered RC planes so i know a thing or two about ruining LiPos (not always on impact) and once they puff, they never entirely recover. Sitting duck, thanks for bringing me back down to earth without making me feel to stupid, much appreciated. again from the RC hobby, 2S (7.4V) is a pretty wimpy battery, (my last plane was pulling 80 Amps on a huge 85c 4s before the wings folded in flight) so i think i have some prejudice against them that i need to unlearn for airsoft. ill try to get some video footage to show the trigger response and post it. it runs really nice now. Edit, i've also swapped out the spring for a M120 and locked locked it to semi. hopefully will shoot just under 400 and be my DMR

Thanks for the detailed reply. You made some good points that I wasn't really aware of. That s a useful video too. I have had those 1 1 0 2 1 0 2 issues before when messing around with different buckings. What I wasn't aware of was the issues caused by the weaker springs we use here in the UK. I think tomorrow I'll try it on a 7.4. It will mean changing connectors but I can always make some adapters up. So long as there is still a decent trigger response I'll be happy. Missed this post. I guess there are a few answers in there. Maybe I'll just leave it in semi

Missed this post. I guess there are a few answers in there. Maybe I'll just leave it in semi

Hi all Don't mean to drag up an old thread but i did a search on feeding problems on high RPS builds and this came up. I've just finished building my first complete gearbox. I was after some really nice trigger response so I've modified the trigger contacts which worked great. it seams to work really nice. i watched lots of guides on shimming etc as, despite doing lots of air seal mods before, i have never changed any gears. It sounds good and VERY snappy on semi - auto. I also ran 16 awg wire which was a massive pain in the arse to fit inside the gearbox - i had to get the dremel out! i also rewired the mossfet so it runs its own trigger circuit in small wires instead of looping through the trigger. I've also installed shs 12:1 gear and a SHS high torque motor - the best (as far as my research could tell) high torque motor within my budget. Im running a 30C 3000Mah 3s lipo (11.1v) -i know this is big, but i had it from another project and it fills the M16 stock and balances the gun nicely. The rate of fire on full-auto is pretty insane. Now i plan on using this gun mostly in semi but i would like to switch to full auto for the occasional burst. The problem i have is that the gun doesn't feed on full auto. my guess is that the magazine spring cant keep up with the ROF. I'm using the metal G&G hi caps. never had problems with them in the past. Can anyone confirm that this is likely to be the problem or am i barking up the wrong tree? would i be better with midcaps, or maybe another brand of hicap? As i said i plan on mainly using this gun in semi so its not such a big deal, its more for my own knowledge as i don't like to be beaten by engineering hurdles. Also, i know i could drop the ROF by using a 2S (7.4V) lipo and this may solve my problem but it would mean changing the connectors on all my SMGS that run the 2S batterries and id rather not do this. Any help appreciated